Former Owner
- John Henry Ellis2
- John Hinsdale Scheide2
- John Read Dore1
- John Singer Sargent1
- John Wright1
- Jonathan Peckover1
- Joseph Anton Koch1
- Joseph Ernst Koch-Sternfeld1
- Joseph Görres1
- Jérôme Bignon1
- Kloster Bredelar1
- Konrad von Maurer3
- Kulturhistorisches Museum Magdeburg1
- Lathrop Colgate Harper1
- Laurence Claiborne Witten II1
- Laurence William Hodson1
- Leicester Harmsworth1
- Librairie Tross1
- Liechtenstein State Library1
- Ludwig Rosenthal1